JEE Main Chemistry question

The correct order of the second ionization potential of carbon, nitrogen, oxygen and fluorine is:

(A)
(B)
(C)Correct
(D)

Answer: (C)

Solution

The second ionization energy removes an electron from the singly-charged cation. (config ), (config ), (config , a stable half-filled configuration) and (config ). Because has an extra-stable half-filled configuration,

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Question ID VK-133581